mac80211: fix crash when unloading drivers (#17706)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

Backport of r42329

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42330 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/kernel/mac80211/patches/008-fix_netdev_unregister.patch

+--- a/net/mac80211/iface.c
++++ b/net/mac80211/iface.c
+@@ -1796,7 +1796,11 @@ void ieee80211_remove_interfaces(struct 
+ 	}
+ 	mutex_unlock(&local->iflist_mtx);
+ 	unregister_netdevice_many(&unreg_list);
++#if (!(LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,45) && \
++       LINUX_VERSION_CODE < KERNEL_VERSION(3,11,0)) && \
++     (LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0)))
+ 	list_del(&unreg_list);
++#endif
+ 
+ 	list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
+ 		list_del(&sdata->list);